1 // SPDX-License-Identifier: GPL-2.0-only 2 3 #include <linux/ceph/ceph_debug.h> 4 5 #include <linux/backing-dev.h> 6 #include <linux/ctype.h> 7 #include <linux/fs.h> 8 #include <linux/inet.h> 9 #include <linux/in6.h> 10 #include <linux/module.h> 11 #include <linux/mount.h> 12 #include <linux/parser.h> 13 #include <linux/sched.h> 14 #include <linux/seq_file.h> 15 #include <linux/slab.h> 16 #include <linux/statfs.h> 17 #include <linux/string.h> 18 19 #include "super.h" 20 #include "mds_client.h" 21 #include "cache.h" 22 23 #include <linux/ceph/ceph_features.h> 24 #include <linux/ceph/decode.h> 25 #include <linux/ceph/mon_client.h> 26 #include <linux/ceph/auth.h> 27 #include <linux/ceph/debugfs.h> 28 29 /* 30 * Ceph superblock operations 31 * 32 * Handle the basics of mounting, unmounting. 33 */ 34 35 /* 36 * super ops 37 */ 38 static void ceph_put_super(struct super_block *s) 39 { 40 struct ceph_fs_client *fsc = ceph_sb_to_client(s); 41 42 dout("put_super\n"); 43 ceph_mdsc_close_sessions(fsc->mdsc); 44 } 45 46 static int ceph_statfs(struct dentry *dentry, struct kstatfs *buf) 47 { 48 struct ceph_fs_client *fsc = ceph_inode_to_client(d_inode(dentry)); 49 struct ceph_mon_client *monc = &fsc->client->monc; 50 struct ceph_statfs st; 51 u64 fsid; 52 int err; 53 u64 data_pool; 54 55 if (fsc->mdsc->mdsmap->m_num_data_pg_pools == 1) { 56 data_pool = fsc->mdsc->mdsmap->m_data_pg_pools[0]; 57 } else { 58 data_pool = CEPH_NOPOOL; 59 } 60 61 dout("statfs\n"); 62 err = ceph_monc_do_statfs(monc, data_pool, &st); 63 if (err < 0) 64 return err; 65 66 /* fill in kstatfs */ 67 buf->f_type = CEPH_SUPER_MAGIC; /* ?? */ 68 69 /* 70 * express utilization in terms of large blocks to avoid 71 * overflow on 32-bit machines. 72 * 73 * NOTE: for the time being, we make bsize == frsize to humor 74 * not-yet-ancient versions of glibc that are broken. 75 * Someday, we will probably want to report a real block 76 * size... whatever that may mean for a network file system! 77 */ 78 buf->f_bsize = 1 << CEPH_BLOCK_SHIFT; 79 buf->f_frsize = 1 << CEPH_BLOCK_SHIFT; 80 81 /* 82 * By default use root quota for stats; fallback to overall filesystem 83 * usage if using 'noquotadf' mount option or if the root dir doesn't 84 * have max_bytes quota set. 85 */ 86 if (ceph_test_mount_opt(fsc, NOQUOTADF) || 87 !ceph_quota_update_statfs(fsc, buf)) { 88 buf->f_blocks = le64_to_cpu(st.kb) >> (CEPH_BLOCK_SHIFT-10); 89 buf->f_bfree = le64_to_cpu(st.kb_avail) >> (CEPH_BLOCK_SHIFT-10); 90 buf->f_bavail = le64_to_cpu(st.kb_avail) >> (CEPH_BLOCK_SHIFT-10); 91 } 92 93 buf->f_files = le64_to_cpu(st.num_objects); 94 buf->f_ffree = -1; 95 buf->f_namelen = NAME_MAX; 96 97 /* Must convert the fsid, for consistent values across arches */ 98 mutex_lock(&monc->mutex); 99 fsid = le64_to_cpu(*(__le64 *)(&monc->monmap->fsid)) ^ 100 le64_to_cpu(*((__le64 *)&monc->monmap->fsid + 1)); 101 mutex_unlock(&monc->mutex); 102 103 buf->f_fsid.val[0] = fsid & 0xffffffff; 104 buf->f_fsid.val[1] = fsid >> 32; 105 106 return 0; 107 } 108 109 110 static int ceph_sync_fs(struct super_block *sb, int wait) 111 { 112 struct ceph_fs_client *fsc = ceph_sb_to_client(sb); 113 114 if (!wait) { 115 dout("sync_fs (non-blocking)\n"); 116 ceph_flush_dirty_caps(fsc->mdsc); 117 dout("sync_fs (non-blocking) done\n"); 118 return 0; 119 } 120 121 dout("sync_fs (blocking)\n"); 122 ceph_osdc_sync(&fsc->client->osdc); 123 ceph_mdsc_sync(fsc->mdsc); 124 dout("sync_fs (blocking) done\n"); 125 return 0; 126 } 127 128 /* 129 * mount options 130 */ 131 enum { 132 Opt_wsize, 133 Opt_rsize, 134 Opt_rasize, 135 Opt_caps_wanted_delay_min, 136 Opt_caps_wanted_delay_max, 137 Opt_caps_max, 138 Opt_readdir_max_entries, 139 Opt_readdir_max_bytes, 140 Opt_congestion_kb, 141 Opt_last_int, 142 /* int args above */ 143 Opt_snapdirname, 144 Opt_mds_namespace, 145 Opt_fscache_uniq, 146 Opt_recover_session, 147 Opt_last_string, 148 /* string args above */ 149 Opt_dirstat, 150 Opt_nodirstat, 151 Opt_rbytes, 152 Opt_norbytes, 153 Opt_asyncreaddir, 154 Opt_noasyncreaddir, 155 Opt_dcache, 156 Opt_nodcache, 157 Opt_ino32, 158 Opt_noino32, 159 Opt_fscache, 160 Opt_nofscache, 161 Opt_poolperm, 162 Opt_nopoolperm, 163 Opt_require_active_mds, 164 Opt_norequire_active_mds, 165 #ifdef CONFIG_CEPH_FS_POSIX_ACL 166 Opt_acl, 167 #endif 168 Opt_noacl, 169 Opt_quotadf, 170 Opt_noquotadf, 171 Opt_copyfrom, 172 Opt_nocopyfrom, 173 }; 174 175 static match_table_t fsopt_tokens = { 176 {Opt_wsize, "wsize=%d"}, 177 {Opt_rsize, "rsize=%d"}, 178 {Opt_rasize, "rasize=%d"}, 179 {Opt_caps_wanted_delay_min, "caps_wanted_delay_min=%d"}, 180 {Opt_caps_wanted_delay_max, "caps_wanted_delay_max=%d"}, 181 {Opt_caps_max, "caps_max=%d"}, 182 {Opt_readdir_max_entries, "readdir_max_entries=%d"}, 183 {Opt_readdir_max_bytes, "readdir_max_bytes=%d"}, 184 {Opt_congestion_kb, "write_congestion_kb=%d"}, 185 /* int args above */ 186 {Opt_snapdirname, "snapdirname=%s"}, 187 {Opt_mds_namespace, "mds_namespace=%s"}, 188 {Opt_recover_session, "recover_session=%s"}, 189 {Opt_fscache_uniq, "fsc=%s"}, 190 /* string args above */ 191 {Opt_dirstat, "dirstat"}, 192 {Opt_nodirstat, "nodirstat"}, 193 {Opt_rbytes, "rbytes"}, 194 {Opt_norbytes, "norbytes"}, 195 {Opt_asyncreaddir, "asyncreaddir"}, 196 {Opt_noasyncreaddir, "noasyncreaddir"}, 197 {Opt_dcache, "dcache"}, 198 {Opt_nodcache, "nodcache"}, 199 {Opt_ino32, "ino32"}, 200 {Opt_noino32, "noino32"}, 201 {Opt_fscache, "fsc"}, 202 {Opt_nofscache, "nofsc"}, 203 {Opt_poolperm, "poolperm"}, 204 {Opt_nopoolperm, "nopoolperm"}, 205 {Opt_require_active_mds, "require_active_mds"}, 206 {Opt_norequire_active_mds, "norequire_active_mds"}, 207 #ifdef CONFIG_CEPH_FS_POSIX_ACL 208 {Opt_acl, "acl"}, 209 #endif 210 {Opt_noacl, "noacl"}, 211 {Opt_quotadf, "quotadf"}, 212 {Opt_noquotadf, "noquotadf"}, 213 {Opt_copyfrom, "copyfrom"}, 214 {Opt_nocopyfrom, "nocopyfrom"}, 215 {-1, NULL} 216 }; 217 218 static int parse_fsopt_token(char *c, void *private) 219 { 220 struct ceph_mount_options *fsopt = private; 221 substring_t argstr[MAX_OPT_ARGS]; 222 int token, intval, ret; 223 224 token = match_token((char *)c, fsopt_tokens, argstr); 225 if (token < 0) 226 return -EINVAL; 227 228 if (token < Opt_last_int) { 229 ret = match_int(&argstr[0], &intval); 230 if (ret < 0) { 231 pr_err("bad option arg (not int) at '%s'\n", c); 232 return ret; 233 } 234 dout("got int token %d val %d\n", token, intval); 235 } else if (token > Opt_last_int && token < Opt_last_string) { 236 dout("got string token %d val %s\n", token, 237 argstr[0].from); 238 } else { 239 dout("got token %d\n", token); 240 } 241 242 switch (token) { 243 case Opt_snapdirname: 244 kfree(fsopt->snapdir_name); 245 fsopt->snapdir_name = kstrndup(argstr[0].from, 246 argstr[0].to-argstr[0].from, 247 GFP_KERNEL); 248 if (!fsopt->snapdir_name) 249 return -ENOMEM; 250 break; 251 case Opt_mds_namespace: 252 kfree(fsopt->mds_namespace); 253 fsopt->mds_namespace = kstrndup(argstr[0].from, 254 argstr[0].to-argstr[0].from, 255 GFP_KERNEL); 256 if (!fsopt->mds_namespace) 257 return -ENOMEM; 258 break; 259 case Opt_recover_session: 260 if (!strncmp(argstr[0].from, "no", 261 argstr[0].to - argstr[0].from)) { 262 fsopt->flags &= ~CEPH_MOUNT_OPT_CLEANRECOVER; 263 } else if (!strncmp(argstr[0].from, "clean", 264 argstr[0].to - argstr[0].from)) { 265 fsopt->flags |= CEPH_MOUNT_OPT_CLEANRECOVER; 266 } else { 267 return -EINVAL; 268 } 269 break; 270 case Opt_fscache_uniq: 271 kfree(fsopt->fscache_uniq); 272 fsopt->fscache_uniq = kstrndup(argstr[0].from, 273 argstr[0].to-argstr[0].from, 274 GFP_KERNEL); 275 if (!fsopt->fscache_uniq) 276 return -ENOMEM; 277 fsopt->flags |= CEPH_MOUNT_OPT_FSCACHE; 278 break; 279 /* misc */ 280 case Opt_wsize: 281 if (intval < (int)PAGE_SIZE || intval > CEPH_MAX_WRITE_SIZE) 282 return -EINVAL; 283 fsopt->wsize = ALIGN(intval, PAGE_SIZE); 284 break; 285 case Opt_rsize: 286 if (intval < (int)PAGE_SIZE || intval > CEPH_MAX_READ_SIZE) 287 return -EINVAL; 288 fsopt->rsize = ALIGN(intval, PAGE_SIZE); 289 break; 290 case Opt_rasize: 291 if (intval < 0) 292 return -EINVAL; 293 fsopt->rasize = ALIGN(intval, PAGE_SIZE); 294 break; 295 case Opt_caps_wanted_delay_min: 296 if (intval < 1) 297 return -EINVAL; 298 fsopt->caps_wanted_delay_min = intval; 299 break; 300 case Opt_caps_wanted_delay_max: 301 if (intval < 1) 302 return -EINVAL; 303 fsopt->caps_wanted_delay_max = intval; 304 break; 305 case Opt_caps_max: 306 if (intval < 0) 307 return -EINVAL; 308 fsopt->caps_max = intval; 309 break; 310 case Opt_readdir_max_entries: 311 if (intval < 1) 312 return -EINVAL; 313 fsopt->max_readdir = intval; 314 break; 315 case Opt_readdir_max_bytes: 316 if (intval < (int)PAGE_SIZE && intval != 0) 317 return -EINVAL; 318 fsopt->max_readdir_bytes = intval; 319 break; 320 case Opt_congestion_kb: 321 if (intval < 1024) /* at least 1M */ 322 return -EINVAL; 323 fsopt->congestion_kb = intval; 324 break; 325 case Opt_dirstat: 326 fsopt->flags |= CEPH_MOUNT_OPT_DIRSTAT; 327 break; 328 case Opt_nodirstat: 329 fsopt->flags &= ~CEPH_MOUNT_OPT_DIRSTAT; 330 break; 331 case Opt_rbytes: 332 fsopt->flags |= CEPH_MOUNT_OPT_RBYTES; 333 break; 334 case Opt_norbytes: 335 fsopt->flags &= ~CEPH_MOUNT_OPT_RBYTES; 336 break; 337 case Opt_asyncreaddir: 338 fsopt->flags &= ~CEPH_MOUNT_OPT_NOASYNCREADDIR; 339 break; 340 case Opt_noasyncreaddir: 341 fsopt->flags |= CEPH_MOUNT_OPT_NOASYNCREADDIR; 342 break; 343 case Opt_dcache: 344 fsopt->flags |= CEPH_MOUNT_OPT_DCACHE; 345 break; 346 case Opt_nodcache: 347 fsopt->flags &= ~CEPH_MOUNT_OPT_DCACHE; 348 break; 349 case Opt_ino32: 350 fsopt->flags |= CEPH_MOUNT_OPT_INO32; 351 break; 352 case Opt_noino32: 353 fsopt->flags &= ~CEPH_MOUNT_OPT_INO32; 354 break; 355 case Opt_fscache: 356 fsopt->flags |= CEPH_MOUNT_OPT_FSCACHE; 357 kfree(fsopt->fscache_uniq); 358 fsopt->fscache_uniq = NULL; 359 break; 360 case Opt_nofscache: 361 fsopt->flags &= ~CEPH_MOUNT_OPT_FSCACHE; 362 kfree(fsopt->fscache_uniq); 363 fsopt->fscache_uniq = NULL; 364 break; 365 case Opt_poolperm: 366 fsopt->flags &= ~CEPH_MOUNT_OPT_NOPOOLPERM; 367 break; 368 case Opt_nopoolperm: 369 fsopt->flags |= CEPH_MOUNT_OPT_NOPOOLPERM; 370 break; 371 case Opt_require_active_mds: 372 fsopt->flags &= ~CEPH_MOUNT_OPT_MOUNTWAIT; 373 break; 374 case Opt_norequire_active_mds: 375 fsopt->flags |= CEPH_MOUNT_OPT_MOUNTWAIT; 376 break; 377 case Opt_quotadf: 378 fsopt->flags &= ~CEPH_MOUNT_OPT_NOQUOTADF; 379 break; 380 case Opt_noquotadf: 381 fsopt->flags |= CEPH_MOUNT_OPT_NOQUOTADF; 382 break; 383 case Opt_copyfrom: 384 fsopt->flags &= ~CEPH_MOUNT_OPT_NOCOPYFROM; 385 break; 386 case Opt_nocopyfrom: 387 fsopt->flags |= CEPH_MOUNT_OPT_NOCOPYFROM; 388 break; 389 #ifdef CONFIG_CEPH_FS_POSIX_ACL 390 case Opt_acl: 391 fsopt->sb_flags |= SB_POSIXACL; 392 break; 393 #endif 394 case Opt_noacl: 395 fsopt->sb_flags &= ~SB_POSIXACL; 396 break; 397 default: 398 BUG_ON(token); 399 } 400 return 0; 401 } 402 403 static void destroy_mount_options(struct ceph_mount_options *args) 404 { 405 dout("destroy_mount_options %p\n", args); 406 kfree(args->snapdir_name); 407 kfree(args->mds_namespace); 408 kfree(args->server_path); 409 kfree(args->fscache_uniq); 410 kfree(args); 411 } 412 413 static int strcmp_null(const char *s1, const char *s2) 414 { 415 if (!s1 && !s2) 416 return 0; 417 if (s1 && !s2) 418 return -1; 419 if (!s1 && s2) 420 return 1; 421 return strcmp(s1, s2); 422 } 423 424 static int compare_mount_options(struct ceph_mount_options *new_fsopt, 425 struct ceph_options *new_opt, 426 struct ceph_fs_client *fsc) 427 { 428 struct ceph_mount_options *fsopt1 = new_fsopt; 429 struct ceph_mount_options *fsopt2 = fsc->mount_options; 430 int ofs = offsetof(struct ceph_mount_options, snapdir_name); 431 int ret; 432 433 ret = memcmp(fsopt1, fsopt2, ofs); 434 if (ret) 435 return ret; 436 437 ret = strcmp_null(fsopt1->snapdir_name, fsopt2->snapdir_name); 438 if (ret) 439 return ret; 440 ret = strcmp_null(fsopt1->mds_namespace, fsopt2->mds_namespace); 441 if (ret) 442 return ret; 443 ret = strcmp_null(fsopt1->server_path, fsopt2->server_path); 444 if (ret) 445 return ret; 446 ret = strcmp_null(fsopt1->fscache_uniq, fsopt2->fscache_uniq); 447 if (ret) 448 return ret; 449 450 return ceph_compare_options(new_opt, fsc->client); 451 } 452 453 static int parse_mount_options(struct ceph_mount_options **pfsopt, 454 struct ceph_options **popt, 455 int flags, char *options, 456 const char *dev_name) 457 { 458 struct ceph_mount_options *fsopt; 459 const char *dev_name_end; 460 int err; 461 462 if (!dev_name || !*dev_name) 463 return -EINVAL; 464 465 fsopt = kzalloc(sizeof(*fsopt), GFP_KERNEL); 466 if (!fsopt) 467 return -ENOMEM; 468 469 dout("parse_mount_options %p, dev_name '%s'\n", fsopt, dev_name); 470 471 fsopt->sb_flags = flags; 472 fsopt->flags = CEPH_MOUNT_OPT_DEFAULT; 473 474 fsopt->wsize = CEPH_MAX_WRITE_SIZE; 475 fsopt->rsize = CEPH_MAX_READ_SIZE; 476 fsopt->rasize = CEPH_RASIZE_DEFAULT; 477 fsopt->snapdir_name = kstrdup(CEPH_SNAPDIRNAME_DEFAULT, GFP_KERNEL); 478 if (!fsopt->snapdir_name) { 479 err = -ENOMEM; 480 goto out; 481 } 482 483 fsopt->caps_wanted_delay_min = CEPH_CAPS_WANTED_DELAY_MIN_DEFAULT; 484 fsopt->caps_wanted_delay_max = CEPH_CAPS_WANTED_DELAY_MAX_DEFAULT; 485 fsopt->max_readdir = CEPH_MAX_READDIR_DEFAULT; 486 fsopt->max_readdir_bytes = CEPH_MAX_READDIR_BYTES_DEFAULT; 487 fsopt->congestion_kb = default_congestion_kb(); 488 489 /* 490 * Distinguish the server list from the path in "dev_name". 491 * Internally we do not include the leading '/' in the path. 492 * 493 * "dev_name" will look like: 494 * <server_spec>[,<server_spec>...]:[<path>] 495 * where 496 * <server_spec> is <ip>[:<port>] 497 * <path> is optional, but if present must begin with '/' 498 */ 499 dev_name_end = strchr(dev_name, '/'); 500 if (dev_name_end) { 501 if (strlen(dev_name_end) > 1) { 502 fsopt->server_path = kstrdup(dev_name_end, GFP_KERNEL); 503 if (!fsopt->server_path) { 504 err = -ENOMEM; 505 goto out; 506 } 507 } 508 } else { 509 dev_name_end = dev_name + strlen(dev_name); 510 } 511 err = -EINVAL; 512 dev_name_end--; /* back up to ':' separator */ 513 if (dev_name_end < dev_name || *dev_name_end != ':') { 514 pr_err("device name is missing path (no : separator in %s)\n", 515 dev_name); 516 goto out; 517 } 518 dout("device name '%.*s'\n", (int)(dev_name_end - dev_name), dev_name); 519 if (fsopt->server_path) 520 dout("server path '%s'\n", fsopt->server_path); 521 522 *popt = ceph_parse_options(options, dev_name, dev_name_end, 523 parse_fsopt_token, (void *)fsopt); 524 if (IS_ERR(*popt)) { 525 err = PTR_ERR(*popt); 526 goto out; 527 } 528 529 /* success */ 530 *pfsopt = fsopt; 531 return 0; 532 533 out: 534 destroy_mount_options(fsopt); 535 return err; 536 } 537 538 /** 539 * ceph_show_options - Show mount options in /proc/mounts 540 * @m: seq_file to write to 541 * @root: root of that (sub)tree 542 */ 543 static int ceph_show_options(struct seq_file *m, struct dentry *root) 544 { 545 struct ceph_fs_client *fsc = ceph_sb_to_client(root->d_sb); 546 struct ceph_mount_options *fsopt = fsc->mount_options; 547 size_t pos; 548 int ret; 549 550 /* a comma between MNT/MS and client options */ 551 seq_putc(m, ','); 552 pos = m->count; 553 554 ret = ceph_print_client_options(m, fsc->client, false); 555 if (ret) 556 return ret; 557 558 /* retract our comma if no client options */ 559 if (m->count == pos) 560 m->count--; 561 562 if (fsopt->flags & CEPH_MOUNT_OPT_DIRSTAT) 563 seq_puts(m, ",dirstat"); 564 if ((fsopt->flags & CEPH_MOUNT_OPT_RBYTES)) 565 seq_puts(m, ",rbytes"); 566 if (fsopt->flags & CEPH_MOUNT_OPT_NOASYNCREADDIR) 567 seq_puts(m, ",noasyncreaddir"); 568 if ((fsopt->flags & CEPH_MOUNT_OPT_DCACHE) == 0) 569 seq_puts(m, ",nodcache"); 570 if (fsopt->flags & CEPH_MOUNT_OPT_INO32) 571 seq_puts(m, ",ino32"); 572 if (fsopt->flags & CEPH_MOUNT_OPT_FSCACHE) { 573 seq_show_option(m, "fsc", fsopt->fscache_uniq); 574 } 575 if (fsopt->flags & CEPH_MOUNT_OPT_NOPOOLPERM) 576 seq_puts(m, ",nopoolperm"); 577 if (fsopt->flags & CEPH_MOUNT_OPT_NOQUOTADF) 578 seq_puts(m, ",noquotadf"); 579 580 #ifdef CONFIG_CEPH_FS_POSIX_ACL 581 if (fsopt->sb_flags & SB_POSIXACL) 582 seq_puts(m, ",acl"); 583 else 584 seq_puts(m, ",noacl"); 585 #endif 586 587 if ((fsopt->flags & CEPH_MOUNT_OPT_NOCOPYFROM) == 0) 588 seq_puts(m, ",copyfrom"); 589 590 if (fsopt->mds_namespace) 591 seq_show_option(m, "mds_namespace", fsopt->mds_namespace); 592 593 if (fsopt->flags & CEPH_MOUNT_OPT_CLEANRECOVER) 594 seq_show_option(m, "recover_session", "clean"); 595 596 if (fsopt->wsize != CEPH_MAX_WRITE_SIZE) 597 seq_printf(m, ",wsize=%d", fsopt->wsize); 598 if (fsopt->rsize != CEPH_MAX_READ_SIZE) 599 seq_printf(m, ",rsize=%d", fsopt->rsize); 600 if (fsopt->rasize != CEPH_RASIZE_DEFAULT) 601 seq_printf(m, ",rasize=%d", fsopt->rasize); 602 if (fsopt->congestion_kb != default_congestion_kb()) 603 seq_printf(m, ",write_congestion_kb=%d", fsopt->congestion_kb); 604 if (fsopt->caps_max) 605 seq_printf(m, ",caps_max=%d", fsopt->caps_max); 606 if (fsopt->caps_wanted_delay_min != CEPH_CAPS_WANTED_DELAY_MIN_DEFAULT) 607 seq_printf(m, ",caps_wanted_delay_min=%d", 608 fsopt->caps_wanted_delay_min); 609 if (fsopt->caps_wanted_delay_max != CEPH_CAPS_WANTED_DELAY_MAX_DEFAULT) 610 seq_printf(m, ",caps_wanted_delay_max=%d", 611 fsopt->caps_wanted_delay_max); 612 if (fsopt->max_readdir != CEPH_MAX_READDIR_DEFAULT) 613 seq_printf(m, ",readdir_max_entries=%d", fsopt->max_readdir); 614 if (fsopt->max_readdir_bytes != CEPH_MAX_READDIR_BYTES_DEFAULT) 615 seq_printf(m, ",readdir_max_bytes=%d", fsopt->max_readdir_bytes); 616 if (strcmp(fsopt->snapdir_name, CEPH_SNAPDIRNAME_DEFAULT)) 617 seq_show_option(m, "snapdirname", fsopt->snapdir_name); 618 619 return 0; 620 } 621 622 /* 623 * handle any mon messages the standard library doesn't understand. 624 * return error if we don't either. 625 */ 626 static int extra_mon_dispatch(struct ceph_client *client, struct ceph_msg *msg) 627 { 628 struct ceph_fs_client *fsc = client->private; 629 int type = le16_to_cpu(msg->hdr.type); 630 631 switch (type) { 632 case CEPH_MSG_MDS_MAP: 633 ceph_mdsc_handle_mdsmap(fsc->mdsc, msg); 634 return 0; 635 case CEPH_MSG_FS_MAP_USER: 636 ceph_mdsc_handle_fsmap(fsc->mdsc, msg); 637 return 0; 638 default: 639 return -1; 640 } 641 } 642 643 /* 644 * create a new fs client 645 * 646 * Success or not, this function consumes @fsopt and @opt. 647 */ 648 static struct ceph_fs_client *create_fs_client(struct ceph_mount_options *fsopt, 649 struct ceph_options *opt) 650 { 651 struct ceph_fs_client *fsc; 652 int page_count; 653 size_t size; 654 int err; 655 656 fsc = kzalloc(sizeof(*fsc), GFP_KERNEL); 657 if (!fsc) { 658 err = -ENOMEM; 659 goto fail; 660 } 661 662 fsc->client = ceph_create_client(opt, fsc); 663 if (IS_ERR(fsc->client)) { 664 err = PTR_ERR(fsc->client); 665 goto fail; 666 } 667 opt = NULL; /* fsc->client now owns this */ 668 669 fsc->client->extra_mon_dispatch = extra_mon_dispatch; 670 ceph_set_opt(fsc->client, ABORT_ON_FULL); 671 672 if (!fsopt->mds_namespace) { 673 ceph_monc_want_map(&fsc->client->monc, CEPH_SUB_MDSMAP, 674 0, true); 675 } else { 676 ceph_monc_want_map(&fsc->client->monc, CEPH_SUB_FSMAP, 677 0, false); 678 } 679 680 fsc->mount_options = fsopt; 681 682 fsc->sb = NULL; 683 fsc->mount_state = CEPH_MOUNT_MOUNTING; 684 fsc->filp_gen = 1; 685 686 atomic_long_set(&fsc->writeback_count, 0); 687 688 err = -ENOMEM; 689 /* 690 * The number of concurrent works can be high but they don't need 691 * to be processed in parallel, limit concurrency. 692 */ 693 fsc->inode_wq = alloc_workqueue("ceph-inode", WQ_UNBOUND, 0); 694 if (!fsc->inode_wq) 695 goto fail_client; 696 fsc->cap_wq = alloc_workqueue("ceph-cap", 0, 1); 697 if (!fsc->cap_wq) 698 goto fail_inode_wq; 699 700 /* set up mempools */ 701 err = -ENOMEM; 702 page_count = fsc->mount_options->wsize >> PAGE_SHIFT; 703 size = sizeof (struct page *) * (page_count ? page_count : 1); 704 fsc->wb_pagevec_pool = mempool_create_kmalloc_pool(10, size); 705 if (!fsc->wb_pagevec_pool) 706 goto fail_cap_wq; 707 708 return fsc; 709 710 fail_cap_wq: 711 destroy_workqueue(fsc->cap_wq); 712 fail_inode_wq: 713 destroy_workqueue(fsc->inode_wq); 714 fail_client: 715 ceph_destroy_client(fsc->client); 716 fail: 717 kfree(fsc); 718 if (opt) 719 ceph_destroy_options(opt); 720 destroy_mount_options(fsopt); 721 return ERR_PTR(err); 722 } 723 724 static void flush_fs_workqueues(struct ceph_fs_client *fsc) 725 { 726 flush_workqueue(fsc->inode_wq); 727 flush_workqueue(fsc->cap_wq); 728 } 729 730 static void destroy_fs_client(struct ceph_fs_client *fsc) 731 { 732 dout("destroy_fs_client %p\n", fsc); 733 734 ceph_mdsc_destroy(fsc); 735 destroy_workqueue(fsc->inode_wq); 736 destroy_workqueue(fsc->cap_wq); 737 738 mempool_destroy(fsc->wb_pagevec_pool); 739 740 destroy_mount_options(fsc->mount_options); 741 742 ceph_destroy_client(fsc->client); 743 744 kfree(fsc); 745 dout("destroy_fs_client %p done\n", fsc); 746 } 747 748 /* 749 * caches 750 */ 751 struct kmem_cache *ceph_inode_cachep; 752 struct kmem_cache *ceph_cap_cachep; 753 struct kmem_cache *ceph_cap_flush_cachep; 754 struct kmem_cache *ceph_dentry_cachep; 755 struct kmem_cache *ceph_file_cachep; 756 struct kmem_cache *ceph_dir_file_cachep; 757 758 static void ceph_inode_init_once(void *foo) 759 { 760 struct ceph_inode_info *ci = foo; 761 inode_init_once(&ci->vfs_inode); 762 } 763 764 static int __init init_caches(void) 765 { 766 int error = -ENOMEM; 767 768 ceph_inode_cachep = kmem_cache_create("ceph_inode_info", 769 sizeof(struct ceph_inode_info), 770 __alignof__(struct ceph_inode_info), 771 SLAB_RECLAIM_ACCOUNT|SLAB_MEM_SPREAD| 772 SLAB_ACCOUNT, ceph_inode_init_once); 773 if (!ceph_inode_cachep) 774 return -ENOMEM; 775 776 ceph_cap_cachep = KMEM_CACHE(ceph_cap, SLAB_MEM_SPREAD); 777 if (!ceph_cap_cachep) 778 goto bad_cap; 779 ceph_cap_flush_cachep = KMEM_CACHE(ceph_cap_flush, 780 SLAB_RECLAIM_ACCOUNT|SLAB_MEM_SPREAD); 781 if (!ceph_cap_flush_cachep) 782 goto bad_cap_flush; 783 784 ceph_dentry_cachep = KMEM_CACHE(ceph_dentry_info, 785 SLAB_RECLAIM_ACCOUNT|SLAB_MEM_SPREAD); 786 if (!ceph_dentry_cachep) 787 goto bad_dentry; 788 789 ceph_file_cachep = KMEM_CACHE(ceph_file_info, SLAB_MEM_SPREAD); 790 if (!ceph_file_cachep) 791 goto bad_file; 792 793 ceph_dir_file_cachep = KMEM_CACHE(ceph_dir_file_info, SLAB_MEM_SPREAD); 794 if (!ceph_dir_file_cachep) 795 goto bad_dir_file; 796 797 error = ceph_fscache_register(); 798 if (error) 799 goto bad_fscache; 800 801 return 0; 802 803 bad_fscache: 804 kmem_cache_destroy(ceph_dir_file_cachep); 805 bad_dir_file: 806 kmem_cache_destroy(ceph_file_cachep); 807 bad_file: 808 kmem_cache_destroy(ceph_dentry_cachep); 809 bad_dentry: 810 kmem_cache_destroy(ceph_cap_flush_cachep); 811 bad_cap_flush: 812 kmem_cache_destroy(ceph_cap_cachep); 813 bad_cap: 814 kmem_cache_destroy(ceph_inode_cachep); 815 return error; 816 } 817 818 static void destroy_caches(void) 819 { 820 /* 821 * Make sure all delayed rcu free inodes are flushed before we 822 * destroy cache. 823 */ 824 rcu_barrier(); 825 826 kmem_cache_destroy(ceph_inode_cachep); 827 kmem_cache_destroy(ceph_cap_cachep); 828 kmem_cache_destroy(ceph_cap_flush_cachep); 829 kmem_cache_destroy(ceph_dentry_cachep); 830 kmem_cache_destroy(ceph_file_cachep); 831 kmem_cache_destroy(ceph_dir_file_cachep); 832 833 ceph_fscache_unregister(); 834 } 835 836 837 /* 838 * ceph_umount_begin - initiate forced umount. Tear down down the 839 * mount, skipping steps that may hang while waiting for server(s). 840 */ 841 static void ceph_umount_begin(struct super_block *sb) 842 { 843 struct ceph_fs_client *fsc = ceph_sb_to_client(sb); 844 845 dout("ceph_umount_begin - starting forced umount\n"); 846 if (!fsc) 847 return; 848 fsc->mount_state = CEPH_MOUNT_SHUTDOWN; 849 ceph_osdc_abort_requests(&fsc->client->osdc, -EIO); 850 ceph_mdsc_force_umount(fsc->mdsc); 851 fsc->filp_gen++; // invalidate open files 852 } 853 854 static int ceph_remount(struct super_block *sb, int *flags, char *data) 855 { 856 sync_filesystem(sb); 857 return 0; 858 } 859 860 static const struct super_operations ceph_super_ops = { 861 .alloc_inode = ceph_alloc_inode, 862 .free_inode = ceph_free_inode, 863 .write_inode = ceph_write_inode, 864 .drop_inode = generic_delete_inode, 865 .evict_inode = ceph_evict_inode, 866 .sync_fs = ceph_sync_fs, 867 .put_super = ceph_put_super, 868 .remount_fs = ceph_remount, 869 .show_options = ceph_show_options, 870 .statfs = ceph_statfs, 871 .umount_begin = ceph_umount_begin, 872 }; 873 874 /* 875 * Bootstrap mount by opening the root directory. Note the mount 876 * @started time from caller, and time out if this takes too long. 877 */ 878 static struct dentry *open_root_dentry(struct ceph_fs_client *fsc, 879 const char *path, 880 unsigned long started) 881 { 882 struct ceph_mds_client *mdsc = fsc->mdsc; 883 struct ceph_mds_request *req = NULL; 884 int err; 885 struct dentry *root; 886 887 /* open dir */ 888 dout("open_root_inode opening '%s'\n", path); 889 req = ceph_mdsc_create_request(mdsc, CEPH_MDS_OP_GETATTR, USE_ANY_MDS); 890 if (IS_ERR(req)) 891 return ERR_CAST(req); 892 req->r_path1 = kstrdup(path, GFP_NOFS); 893 if (!req->r_path1) { 894 root = ERR_PTR(-ENOMEM); 895 goto out; 896 } 897 898 req->r_ino1.ino = CEPH_INO_ROOT; 899 req->r_ino1.snap = CEPH_NOSNAP; 900 req->r_started = started; 901 req->r_timeout = fsc->client->options->mount_timeout; 902 req->r_args.getattr.mask = cpu_to_le32(CEPH_STAT_CAP_INODE); 903 req->r_num_caps = 2; 904 err = ceph_mdsc_do_request(mdsc, NULL, req); 905 if (err == 0) { 906 struct inode *inode = req->r_target_inode; 907 req->r_target_inode = NULL; 908 dout("open_root_inode success\n"); 909 root = d_make_root(inode); 910 if (!root) { 911 root = ERR_PTR(-ENOMEM); 912 goto out; 913 } 914 dout("open_root_inode success, root dentry is %p\n", root); 915 } else { 916 root = ERR_PTR(err); 917 } 918 out: 919 ceph_mdsc_put_request(req); 920 return root; 921 } 922 923 924 925 926 /* 927 * mount: join the ceph cluster, and open root directory. 928 */ 929 static struct dentry *ceph_real_mount(struct ceph_fs_client *fsc) 930 { 931 int err; 932 unsigned long started = jiffies; /* note the start time */ 933 struct dentry *root; 934 935 dout("mount start %p\n", fsc); 936 mutex_lock(&fsc->client->mount_mutex); 937 938 if (!fsc->sb->s_root) { 939 const char *path; 940 err = __ceph_open_session(fsc->client, started); 941 if (err < 0) 942 goto out; 943 944 /* setup fscache */ 945 if (fsc->mount_options->flags & CEPH_MOUNT_OPT_FSCACHE) { 946 err = ceph_fscache_register_fs(fsc); 947 if (err < 0) 948 goto out; 949 } 950 951 if (!fsc->mount_options->server_path) { 952 path = ""; 953 dout("mount opening path \\t\n"); 954 } else { 955 path = fsc->mount_options->server_path + 1; 956 dout("mount opening path %s\n", path); 957 } 958 959 ceph_fs_debugfs_init(fsc); 960 961 root = open_root_dentry(fsc, path, started); 962 if (IS_ERR(root)) { 963 err = PTR_ERR(root); 964 goto out; 965 } 966 fsc->sb->s_root = dget(root); 967 } else { 968 root = dget(fsc->sb->s_root); 969 } 970 971 fsc->mount_state = CEPH_MOUNT_MOUNTED; 972 dout("mount success\n"); 973 mutex_unlock(&fsc->client->mount_mutex); 974 return root; 975 976 out: 977 mutex_unlock(&fsc->client->mount_mutex); 978 return ERR_PTR(err); 979 } 980 981 static int ceph_set_super(struct super_block *s, void *data) 982 { 983 struct ceph_fs_client *fsc = data; 984 int ret; 985 986 dout("set_super %p data %p\n", s, data); 987 988 s->s_flags = fsc->mount_options->sb_flags; 989 s->s_maxbytes = MAX_LFS_FILESIZE; 990 991 s->s_xattr = ceph_xattr_handlers; 992 s->s_fs_info = fsc; 993 fsc->sb = s; 994 fsc->max_file_size = 1ULL << 40; /* temp value until we get mdsmap */ 995 996 s->s_op = &ceph_super_ops; 997 s->s_d_op = &ceph_dentry_ops; 998 s->s_export_op = &ceph_export_ops; 999 1000 s->s_time_gran = 1; 1001 s->s_time_min = 0; 1002 s->s_time_max = U32_MAX; 1003 1004 ret = set_anon_super(s, NULL); /* what is that second arg for? */ 1005 if (ret != 0) 1006 goto fail; 1007 1008 return ret; 1009 1010 fail: 1011 s->s_fs_info = NULL; 1012 fsc->sb = NULL; 1013 return ret; 1014 } 1015 1016 /* 1017 * share superblock if same fs AND options 1018 */ 1019 static int ceph_compare_super(struct super_block *sb, void *data) 1020 { 1021 struct ceph_fs_client *new = data; 1022 struct ceph_mount_options *fsopt = new->mount_options; 1023 struct ceph_options *opt = new->client->options; 1024 struct ceph_fs_client *other = ceph_sb_to_client(sb); 1025 1026 dout("ceph_compare_super %p\n", sb); 1027 1028 if (compare_mount_options(fsopt, opt, other)) { 1029 dout("monitor(s)/mount options don't match\n"); 1030 return 0; 1031 } 1032 if ((opt->flags & CEPH_OPT_FSID) && 1033 ceph_fsid_compare(&opt->fsid, &other->client->fsid)) { 1034 dout("fsid doesn't match\n"); 1035 return 0; 1036 } 1037 if (fsopt->sb_flags != other->mount_options->sb_flags) { 1038 dout("flags differ\n"); 1039 return 0; 1040 } 1041 return 1; 1042 } 1043 1044 /* 1045 * construct our own bdi so we can control readahead, etc. 1046 */ 1047 static atomic_long_t bdi_seq = ATOMIC_LONG_INIT(0); 1048 1049 static int ceph_setup_bdi(struct super_block *sb, struct ceph_fs_client *fsc) 1050 { 1051 int err; 1052 1053 err = super_setup_bdi_name(sb, "ceph-%ld", 1054 atomic_long_inc_return(&bdi_seq)); 1055 if (err) 1056 return err; 1057 1058 /* set ra_pages based on rasize mount option? */ 1059 sb->s_bdi->ra_pages = fsc->mount_options->rasize >> PAGE_SHIFT; 1060 1061 /* set io_pages based on max osd read size */ 1062 sb->s_bdi->io_pages = fsc->mount_options->rsize >> PAGE_SHIFT; 1063 1064 return 0; 1065 } 1066 1067 static struct dentry *ceph_mount(struct file_system_type *fs_type, 1068 int flags, const char *dev_name, void *data) 1069 { 1070 struct super_block *sb; 1071 struct ceph_fs_client *fsc; 1072 struct dentry *res; 1073 int err; 1074 int (*compare_super)(struct super_block *, void *) = ceph_compare_super; 1075 struct ceph_mount_options *fsopt = NULL; 1076 struct ceph_options *opt = NULL; 1077 1078 dout("ceph_mount\n"); 1079 1080 #ifdef CONFIG_CEPH_FS_POSIX_ACL 1081 flags |= SB_POSIXACL; 1082 #endif 1083 err = parse_mount_options(&fsopt, &opt, flags, data, dev_name); 1084 if (err < 0) { 1085 res = ERR_PTR(err); 1086 goto out_final; 1087 } 1088 1089 /* create client (which we may/may not use) */ 1090 fsc = create_fs_client(fsopt, opt); 1091 if (IS_ERR(fsc)) { 1092 res = ERR_CAST(fsc); 1093 goto out_final; 1094 } 1095 1096 err = ceph_mdsc_init(fsc); 1097 if (err < 0) { 1098 res = ERR_PTR(err); 1099 goto out; 1100 } 1101 1102 if (ceph_test_opt(fsc->client, NOSHARE)) 1103 compare_super = NULL; 1104 sb = sget(fs_type, compare_super, ceph_set_super, flags, fsc); 1105 if (IS_ERR(sb)) { 1106 res = ERR_CAST(sb); 1107 goto out; 1108 } 1109 1110 if (ceph_sb_to_client(sb) != fsc) { 1111 destroy_fs_client(fsc); 1112 fsc = ceph_sb_to_client(sb); 1113 dout("get_sb got existing client %p\n", fsc); 1114 } else { 1115 dout("get_sb using new client %p\n", fsc); 1116 err = ceph_setup_bdi(sb, fsc); 1117 if (err < 0) { 1118 res = ERR_PTR(err); 1119 goto out_splat; 1120 } 1121 } 1122 1123 res = ceph_real_mount(fsc); 1124 if (IS_ERR(res)) 1125 goto out_splat; 1126 dout("root %p inode %p ino %llx.%llx\n", res, 1127 d_inode(res), ceph_vinop(d_inode(res))); 1128 return res; 1129 1130 out_splat: 1131 ceph_mdsc_close_sessions(fsc->mdsc); 1132 deactivate_locked_super(sb); 1133 goto out_final; 1134 1135 out: 1136 destroy_fs_client(fsc); 1137 out_final: 1138 dout("ceph_mount fail %ld\n", PTR_ERR(res)); 1139 return res; 1140 } 1141 1142 static void ceph_kill_sb(struct super_block *s) 1143 { 1144 struct ceph_fs_client *fsc = ceph_sb_to_client(s); 1145 dev_t dev = s->s_dev; 1146 1147 dout("kill_sb %p\n", s); 1148 1149 ceph_mdsc_pre_umount(fsc->mdsc); 1150 flush_fs_workqueues(fsc); 1151 1152 generic_shutdown_super(s); 1153 1154 fsc->client->extra_mon_dispatch = NULL; 1155 ceph_fs_debugfs_cleanup(fsc); 1156 1157 ceph_fscache_unregister_fs(fsc); 1158 1159 destroy_fs_client(fsc); 1160 free_anon_bdev(dev); 1161 } 1162 1163 static struct file_system_type ceph_fs_type = { 1164 .owner = THIS_MODULE, 1165 .name = "ceph", 1166 .mount = ceph_mount, 1167 .kill_sb = ceph_kill_sb, 1168 .fs_flags = FS_RENAME_DOES_D_MOVE, 1169 }; 1170 MODULE_ALIAS_FS("ceph"); 1171 1172 int ceph_force_reconnect(struct super_block *sb) 1173 { 1174 struct ceph_fs_client *fsc = ceph_sb_to_client(sb); 1175 int err = 0; 1176 1177 ceph_umount_begin(sb); 1178 1179 /* Make sure all page caches get invalidated. 1180 * see remove_session_caps_cb() */ 1181 flush_workqueue(fsc->inode_wq); 1182 1183 /* In case that we were blacklisted. This also reset 1184 * all mon/osd connections */ 1185 ceph_reset_client_addr(fsc->client); 1186 1187 ceph_osdc_clear_abort_err(&fsc->client->osdc); 1188 1189 fsc->blacklisted = false; 1190 fsc->mount_state = CEPH_MOUNT_MOUNTED; 1191 1192 if (sb->s_root) { 1193 err = __ceph_do_getattr(d_inode(sb->s_root), NULL, 1194 CEPH_STAT_CAP_INODE, true); 1195 } 1196 return err; 1197 } 1198 1199 static int __init init_ceph(void) 1200 { 1201 int ret = init_caches(); 1202 if (ret) 1203 goto out; 1204 1205 ceph_flock_init(); 1206 ret = register_filesystem(&ceph_fs_type); 1207 if (ret) 1208 goto out_caches; 1209 1210 pr_info("loaded (mds proto %d)\n", CEPH_MDSC_PROTOCOL); 1211 1212 return 0; 1213 1214 out_caches: 1215 destroy_caches(); 1216 out: 1217 return ret; 1218 } 1219 1220 static void __exit exit_ceph(void) 1221 { 1222 dout("exit_ceph\n"); 1223 unregister_filesystem(&ceph_fs_type); 1224 destroy_caches(); 1225 } 1226 1227 module_init(init_ceph); 1228 module_exit(exit_ceph); 1229 1230 MODULE_AUTHOR("Sage Weil <sage@newdream.net>"); 1231 MODULE_AUTHOR("Yehuda Sadeh <yehuda@hq.newdream.net>"); 1232 MODULE_AUTHOR("Patience Warnick <patience@newdream.net>"); 1233 MODULE_DESCRIPTION("Ceph filesystem for Linux"); 1234 MODULE_LICENSE("GPL"); 1235